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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4a84fe46cebc191a55c1b8264975b8a74e05cc3f563a0650635cb3c6a1c241e' 
  AND token = 'SshHlSrdCM0gzfTHsPONxASujpJ4pZP5OexFQiad0AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}